I painted the wheels silver, and according to the MF Color schemes, the rims are silver and the centers are red. Just how much of the center is red? And is this the same red as the rest of the tractor?

Yes, same red. Also the whole center part is red, all the way out to where the rim starts. One suggestion, let the silver overspray really set before working with the red. Either that, or clean off any silver where the red will go. I found the red would lift some of the flakes and then you have to clean the red off & start over.

Here's how I 2 toned the rims on my 12. Sure beat doing hours of tapeing.
Took a few measurements, and cutout the blocker out of craft paper. Little,
or no tape made contact with the fresh silver mist grey.

Here's how I 2 toned the rims on my 12. Sure beat doing hours of tapeing.Took a few measurements, and cutout the blocker out of craft paper. Little,or no tape made contact with the fresh silver mist grey.

I did mine the same way you did yours Will.I taped the first one and then made the craft paper cutout cause I did want to do all that tapping again.